Build a messaging app based on this API

I need a competent programmer to build a simple mobile webpage that allows the users to type in their messages and get those messages sent out to a list of similar users who opt in to receive these information.

The API is open sourced, could be found here -> [url removed, login to view]

This mobile program will make use of this API to send out messages to users who have Whatsapp installed in their mobile phones.

This program will also need to bypass the broadcast restriction of 25, possibly by doing a batch send to the server.

Let me know if this is workable, let me know how you intend to acheive this project. Thanks!

** I will not send out any payment until proof of work is completed (screen capture, etc). If you cannot accept this, kindly do not bid.